Acquired Loans Part 2 (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended			12 Months Ended		3 Months Ended	12 Months Ended		3 Months Ended		12 Months Ended		3 Months Ended		12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014 Acquired Impaired [Member] Covered Loans [Member]	Dec. 31, 2013 Acquired Impaired [Member] Covered Loans [Member]		Mar. 31, 2014 Acquired Impaired [Member] Noncovered Loans [Member]	Dec. 31, 2013 Acquired Impaired [Member] Noncovered Loans [Member]		Mar. 31, 2014 Acquired Not ASC 310-30 [Member] Covered Loans [Member]		Dec. 31, 2013 Acquired Not ASC 310-30 [Member] Covered Loans [Member]		Mar. 31, 2014 Acquired Not ASC 310-30 [Member] Noncovered Loans [Member]		Dec. 31, 2013 Acquired Not ASC 310-30 [Member] Noncovered Loans [Member]
Carrying value of acquired loans [Abstract]
Net carrying value, beginning			$ 30,166	$ 45,391		$ 639,656	$ 72,942		$ 1,663	[1]	$ 2,460	[1]	$ 123,085	[1]	$ 6,696	[1]
Loans acquired			0	0	[2]	0	790,335	[2]	0	[1]	0	[1],[2]	0		153,900	[1],[2]
Accretion to interest income	12,709	7,816	1,020	5,150		11,689	35,538		1	[1]	159	[1]	456	[1]	2,628	[1]
Payments received, net			(2,763)	(18,976)		(42,834)	(229,618)		171	[1]	(819)	[1]	(4,748)	[1]	(39,281)	[1]
Other			25	(3,202)		(13,417)	(24,177)		0	[1]	(137)	[1]	(7,489)	[1]	(858)	[1]
Less change in allowance for loan losses, acquired loans			587	1,803		(1,491)	(5,364)		0	[1]	0	[1]	0	[1]	0	[1]
Net carrying value, ending			$ 29,035	$ 30,166		$ 593,603	$ 639,656		$ 1,835	[1]	$ 1,663	[1]	$ 111,304	[1]	$ 123,085	[1]

[1] Acquired nonimpaired loans consist of revolving credit agreements and commercial leases that are not in scope for FASB ASC Topic 310-30.

[2] Adjusted fair value of loans acquired from BancTrust on February 15, 2013.